Update SDL to 2.0.18

libs/SDL2/test/checkkeys.c

@@ -1,5 +1,5 @@
 /*
-  Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org>
+  Copyright (C) 1997-2021 Sam Lantinga <slouken@libsdl.org>
 
   This software is provided 'as-is', without any express or implied
   warranty.  In no event will the authors be held liable for any damages
@@ -86,6 +86,8 @@ print_modifiers(char **text, size_t *maxlen)
         print_string(text, maxlen, " CAPS");
     if (mod & KMOD_MODE)
         print_string(text, maxlen, " MODE");
+    if (mod & KMOD_SCROLL)
+        print_string(text, maxlen, " SCROLL");
 }
 
 static void
@@ -135,9 +137,10 @@ PrintKey(SDL_Keysym * sym, SDL_bool pressed, SDL_bool repeat)
 }
 
 static void
-PrintText(char *eventtype, char *text)
+PrintText(const char *eventtype, const char *text)
 {
-    char *spot, expanded[1024];
+    const char *spot;
+    char expanded[1024];
 
     expanded[0] = '\0';
     for ( spot = text; *spot; ++spot )
@@ -199,6 +202,7 @@ int
 main(int argc, char *argv[])
 {
     SDL_Window *window;
+    SDL_Renderer *renderer;
 
     /* Enable standard application logging */
     SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
@@ -219,6 +223,12 @@ main(int argc, char *argv[])
         quit(2);
     }
 
+    /* On wayland, no window will actually show until something has
+       actually been displayed.
+    */
+    renderer = SDL_CreateRenderer(window, -1, 0);
+    SDL_RenderPresent(renderer);
+
 #if __IPHONEOS__
     /* Creating the context creates the view, which we need to show keyboard */
     SDL_GL_CreateContext(window);